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Image copyright James St Clair Clever, tool-using crows have surprised scientists once again with remarkable problem-solving skills. In a task designed to test their tool-making prowess, New Caledonian crows spontaneously put together two short, combinable sticks to make a longer “fishing rod” to reach a piece of food. The findings are published in the journal […]

Image copyright Getty Images Image caption The researchers say cyan could be added or taken away to prevent or encourage sleep The colour cyan – between green and blue – is a hidden factor in encouraging or preventing sleep, according to biologists. University of Manchester researchers say higher levels of cyan keep people awake, while […]